Debian Linux上的pyodbc/FreeTDS/unixODBC:TDS版本的问题

Question

Debian Linux上的pyodbc/FreeTDS/unixODBC:TDS版本的问题

tcd*_*dyl 15 unixodbc pyodbc freetds sql-server-2008

我在Debian Lenny(5.0.7)上成功使用pyodbc时遇到了一些麻烦.具体来说,我似乎无法获取NVARCHAR值(不是SQL Server专家,所以对我很容易:)).

大多数传统查询都可以.例如,table1中的行数产生

cursor.execute("SELECT count(id) from table1")
<pyodbc.Cursor object at 0xb7b9b170>
>>> cursor.fetchall()
[(27, )]

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就像完全转储ID一样

>>> cursor.execute("SELECT id FROM table1")
<pyodbc.Cursor object at 0xb7b9b170>
>>> cursor.fetchall()
[(0.0, ), (3.0, ), (4.0, ), (5.0, ), (6.0, ), (7.0, ), (8.0, ), (11.0, ), (12.0, ), (18.0, ), (19.0, ), (20.0, ), (21.0, ), (22.0, ), (23.0, ), (24.0, ), (25.0, ), (26.0, ), (27.0, ), (28.0, ), (29.0, ), (32.0, ), (33.0, ), (34.0, ), (35.0, ), (36.0, ), (37.0, )]

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但是名称转储(同样,NVARCHAR类型)也没有

>>> cursor.execute("SELECT name FROM table1")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
pyodbc.ProgrammingError: ('42000', '[42000] [FreeTDS][SQL Server]Unicode data in a Unicode-only collation or ntext data cannot be sent to clients using DB-Library (such as ISQL) or ODBC version 3.7 or earlier. (4004) (SQLExecDirectW)')

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......关键错误是

pyodbc.ProgrammingError:('42000','[42000] [FreeTDS] [SQL Server]只能使用Unicode-collation或ntext数据的Unicode数据不能使用DB-Library(如ISQL)或ODBC版本3.7或早些时候.(4004)(SQLExecDirectW)')

这在表格中是一致的.

我已经尝试了各自的各种不同版本,但现在我正在运行unixODBC 2.2.11(来自lenny repos),FreeTDS 0.91(从源代码构建./configure --enable-msdblib --with-tdsver=8.0),以及pyodbc 3.0.3(从源代码构建).

使用类似的组合(unixODBC 2.3.0,FreeTDS 0.91,pyodbc 3.0.3),相同的代码适用于Mac OS X 10.7.2.

我搜索了高低,调查了这里和这里提出的解决方案,并重新编译unixODBC和FreeTDS的不同版本,但仍然没有骰子.下面提供的相关配置文件:

user@host:~$ cat /usr/local/etc/freetds.conf
#$Id: freetds.conf,v 1.12 2007/12/25 06:02:36 jklowden Exp $
#
# This file is installed by FreeTDS if no file by the same 
# name is found in the installation directory.  
#
# For information about the layout of this file and its settings, 
# see the freetds.conf manpage "man freetds.conf".  

# Global settings are overridden by those in a database
# server specific section
[global]
        # TDS protocol version
        tds version = 8.0
        client charset = UTF-8

        # Whether to write a TDSDUMP file for diagnostic purposes
        # (setting this to /tmp is insecure on a multi-user system)
;       dump file = /tmp/freetds.log
;       debug flags = 0xffff

        # Command and connection timeouts
;       timeout = 10
;       connect timeout = 10

        # If you get out-of-memory errors, it may mean that your client
        # is trying to allocate a huge buffer for a TEXT field.  
        # Try setting 'text size' to a more reasonable limit 
        text size = 64512

# A typical Sybase server
[egServer50]
        host = symachine.domain.com
        port = 5000
        tds version = 5.0

# A typical Microsoft server
[egServer70]
        host = ntmachine.domain.com
        port = 1433
        tds version = 8.0

[foo]
        host = foo.bar.com
        port = 1433
        tds version = 8.0

user@host:~$ cat /etc/odbc.ini 
[foo]
Description     = Foo
Driver          = foobar
Trace           = No
Database        = db
Server          = foo.bar.com
Port            = 1433
TDS_Version     = 8.0
user@host:~$ cat /etc/odbcinst.ini 
[foobar]
Description     = Description
Driver          = /usr/lib/odbc/libtdsodbc.so
Setup           = /usr/lib/odbc/libtdsS.so
CPTimeout       =
CPReuse         =

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任何建议或方向将非常感谢!